Photographic apparatus



June 16, 1942. O. RISZDORFER 2,286,833

PHOTOGRAPHIC APPARATUS Filed July 22, 1959 ODO'N RISZD ORFER A INVENTORBY Mm A T7 ORNE Y.

- identical reference mark Patented June 16, 1942 2,286,833 PHOTOGRAPH)APPARATUS fidiin Biszdorfer, Budapest, Hungary Application July 22,1939, Serial No.

In Hungary July 23, 1938 1 Claim.

The invention relates to a photographic roll film camera with electricexposure meter built in. The substance of the invention consists in thatthe photo-electric cell is built into a folding camera in such a mannerthat in the closed condition of the camera the photo-electric cell isscreened against any incidence of light, whilst in the opened conditionof the camera it is the camera running base capable of being tiltedopen 1. e., the bed, that protects the photoelectric cell,

against undesirable vertically incident light.

According to the invention, it is also possible to provide light screenson both sides of the photoelectric cell, which in the closed conditionof the camera are covering the photo-electric cell and are in case ofopening the camera pivoted into a position in which they are screeningthe photo-electric cell against lateral light. By utilizing the foldingbed as a light'screen and the light screens arranged on bothsides of thephoto-electric cell it is ensured that it is substantially only from theobject to be photographed that rays of light will fall on thephotoelectric cell.

As, usually,'it is the ground or, in general, dark objects that aresituated below the photographic camera, from which objects no intenselight is .radiated, a light screen screening the photo-electric cellfrom below can be dispensed wi h.

By keeping away the upper and lateral light not coming from the objectto be photographed, it is insured that it is substantially only thelight coming from the object to be photographed that isfiised formeasurement by the photo-electric ce Further, it is possible accordingto the invention to arrange the photo-cell in or on the camera bed, thelight coming from the object to be photographed falling on thephoto-electric cell either directly or through the aid of a miror.

A few embodiments, shown by way of example of cameras according to theinvention are repre sented on the accompanying drawing, in which:

Fig. 1 is a side elevation and Fig. 2 a front elevation 'of oneembodiment;

Fig. 3 is aside elevation and Fig. 4 a front elevation of anotherembodiment;

In all figures similar parts are marked with In the embodiment shown inFigs. 1 and 2 a folding type roll-film camera I4 is provided with acombined range and view finder having entrance windows II and IS. Thefolding bed l'i I as is well known, forms a support for the-objectivelens socket i3, its associated bellows "and the supporting struts l9.

In the folding bed I! there is provided an axle 2| around which asupporting part 22 of a photoelectric cell 23 is pivotable. Thesupporting part 22 of the cell 23 carries a'toothedsegment 24 the teethof which are cooperating with a gear wheel 23 journalled on theextension piece 25 so as to be pivotable around the axle 26 and meshingwith the toothed segment 21 fixed on the camera casing l4. On both sidesof the photocell 28 screens 29, 30 are provided which are pivotablearound their relative axles 3| and loaded by springs 32 tending todeflect the screens inwardsbelow the bed II.

If the camera bed I! is opened, the gear wheel 28 rolls on the fixedtoothed segment 21 and sets the toothed segment 24 together with thephotocell 23 into the position traced on Fig. 1. In this position .thephoto-cell 23 is protected against all rays coming from above as well asagainst those coming from the side, other than those coming from theobject to be photographed. If the bed' is pivoted in the upwarddirection, 1. e., is closed,

the setting mechanism composed of the toothed segments 21 and 24 and ofthe gear wheel 28 will 4 become displaced in the opposite sense, so thatthe photo-cell 23 will be pivoted back into the recess 33 of 'the bed l1and the screens 29, 30 will under the action of the springs 32 placethemselves above the carrier 22 of the photo cell. The recess 33 issurrounded on all four sides by laths 34, 35, so that the photo-cellwill in'this position i. e. with the camera closed, be protected againstany incidence of light. The camera bed I1 is journalled pivotably, in amanner per se known, on the axle 31 by'means of hinges 36.

In the case of the embodiment according to Figs. 3 and 4 the photo-cell23 is arranged in a carrier 33 which is fixed on camera. When the camerais open light is directed to the photo-cell by a mirror 39 which isarranged so as to be pivotable around the axle 40 provided in the bedbecome pivoted towards the left and as soon as I the articulation 42reaches the other side of the connecting line 46 of the pivots 43 and41, the

the bed ll of the II. The mirror 33 carries an arm 4| which is connectedthrough an articu- 'If, when closing I from light coming spring 45 willbecome discharged and will pivot the mirror 39 into the recess 33 of thebed I'I, so that the mirror 39 will cover the photo-cell 23. Whenopening the bed H, the mirror 39 will be displaced in a similar mannerinto the position traced on the drawing by means of the settingmechanism 42, 43, and 45. Alongside the mirror there are arranged, inthe case of this embodiment also, screens 29 and 30, fitted with springs32 in the same way as in the case of the embodiments according to Figs.1 and 2. the bed 11 the mirror is folded down on the photo-cell by'thesetting mechanism,

4|, 43 and 41 described, the screens 29 and 30 will under the pressureof the springs 32 become placed over the mirror.

It is thus evident that the scribed above provides a compact andconvenient arrangement for a folding camera whereby a light-sensitivecell is protected while the camera is in folded position, and when thecamera is opened for use the. cell is exposed to light coming bephotographed and shielded from outside such field.

from the field to invention as de- What I claim is:

In a folding camera, from a vertical closed position to a horizontalposition in which the camera is open for use, a photo cell pivotallymounted on the bed member for movement from a position flat against andfacing said member to a position perpendicular to said member, meansoperative upon the movement of said member to open position for movingsaid cell from its flat position to its perpendicular one with respectto the bed member, said means comprising a pinion rotatably mounted onan arm secured to the bed member and positioned between and meshing witha stationary gear segment secured to the camera body and a gear segmentsecured to and movable with the cell and screening means for protectingthe'cell from laterally incident light in open camera position and forcovering the cell in closed camera position, the position of thescreening means being controlled by the change in position of the cell.

boon RISZDORFER.

a bed member movable v

